Active since 1984 under the If, Bwana name, making music that has swung between fairly spontaneous studio constructions and more process-oriented compositions. Ran the cassette label Sound of Pig Music in the 1980s and co-founded and continues to run the experimental music label Pogus. Plays bass guitar in the long-lasting, legendary punk/post-punk band The Styrenes. Recordings of his work have been released on the Tellus, Anckarstrom, Ants, Absurd, GD Stereo, Odradek, Monochrome Vision, and Pogus labels. Recent projects have included a sound art commission by WDR Koln, a collaboration with video artist Katherine Liberovskaya on "Take-off", which has been shown internationally, and the premiere of "Three Songs in Search of a Voice", a "nohtopera" with MutaMYTHeatre - music by Margolis and text and voice, Lisa Barnard.